<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    .p1 {
        color: red;
    }
    .p2 {
        font-size: 100px;
    }
</style>
<body>
    你好
    <div>111</div>
    <h1 class="p1 p2">标题哦</h1>
    <p>段落哦</p>
    <p class="p1 p2">段落哦1</p>
</body>
</html>